Mama started working again

Mama found a full-time job about half an hour away from home right after St.Patrick's day weekend. On her first day, she let me out to go to the bathroom before she left in the morning. She thought it was going to be possible to come home everyday at lunch time and let me out again. It didn't work! There was not enough time. Since I haven't done "my business" during that short time, she decided to return to work and leave me in the backyard for 4 more hours until she got back home. She had the best of intentions, but 4 hours in the backyard drove me mad. When she got back, I was so angry that I shouted at her and ran in circles several times. Some adjustments needed to be made in order to accomodate all my needs. Why does Mama go to work and doesn't spend much time with me anymore?